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Finding the Fourth Proportional to 389,959.80, 583,955.55 and 256,115.40

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Solution

The fourth proportional to 389,959.80, 583,955.55 and 256,115.40 is: 383,526.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,959.80 : 583,955.55 = 256,115.40 : x
  2. Step 2: Convert to fraction form
    389,959.80/583,955.55 = 256,115.40/x
  3. Step 3: Cross multiply
    389,959.80x = 583,955.55 × 256,115.40
  4. Step 4: Simplify right side
    389,959.80x = 149,560,009,270.47
  5. Step 5: Solve for x
    x = 149,560,009,270.47/389,959.80
  6. Step 6: Final answer
    x = 383,526.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.